On 8/28/14, 6:45 AM, Chris wrote:
Boy you're not kidding about the muscles part! My buddy has the aluminum
spidermast, and although it is well made, it is beyond difficult to push up
with even the lightweight spiderbeam on top. If you have any kind of wind it
adds downforce on the mast in addition to the existing weight and friction
between telescoping sections. My buddy came up with a jack system to push the
sections up mechanically, which helped a great deal, but added complexity and
extra steps to the process.
Do you have any details on the jacking arrangement?
And for Marko, how do you do the rotor at the bottom, and have guys? Do
you have some sort of bearing that the guys attach to?
Chris
KF7P
Begin forwarded message:
From: Marko L Myllymaki <marko.l.myllymaki@gmail.com>
Date: August 28, 2014 12:01:58 am MDT
To: towertalk@contesting.com
Subject: [TowerTalk] Push Up Towers
I have had very good experiences with Spiderbeam masts. I have two such 33
ft Spiderbeam heavy duty masts in ZD8 at our annual field day QTH in
Oct-Nov each holding A3S yagi. I have also had one such exact setup on my
backyard for a year now. You can have small rotor like smallest Yaesu 450
or 800 at the bottom turning entire mast. Good workout to push it up but
once it is up it will stay if guyed right with good Dacron. I use
Spiderbeam tripods (actually quadpod) to build and support entire system
while working on it (rotor, mast, antenna) and then get 4 helpers to do
push up (one for each guy and 2 at the base one with good muscles). Taking
down is easier and I have done it by myself several times, although it is
probably pushing it.
73 de Marko N5ZO / ZD8O
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